Liquid cooling plate, energy storage device, energy storage system and electric equipment

Abstract

The embodiment of the invention relates to the technical field of energy storage, and provides a liquid cooling plate, an energy storage device, an energy storage system and electric equipment, the liquid cooling plate comprises a liquid cooling plate body and a flow channel, the liquid cooling plate body is provided with a cooling unit, the cooling unit is in heat conduction connection with a to-be-cooled structure, and the cooling unit comprises at least two cooling surfaces; the flow channel is arranged on the liquid cooling plate body and is provided with a liquid inlet and a liquid outlet; the flow channel comprises a drainage branch and a heat exchange unit, the heat exchange unit corresponds to the structure to be cooled, the drainage branch corresponds to the heat exchange unit, one end of the drainage branch is communicated with the liquid inlet, and the inlet of the heat exchange unit on each cooling surface is communicated with the other end of the drainage branch. The liquid cooling plate provided by the embodiment of the invention at least can improve the heat dissipation effect of the liquid cooling plate.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of energy storage, in particular to a liquid cooling plate, an energy storage device, an energy storage system and an electric equipment. BACKGROUND

[0002] At present, the energy storage industry is in a stage of rapid development, and higher requirements are put forward for battery management systems, especially thermal management technology. In the thermal management system, liquid cooling technology has become a core means to ensure the stability of battery performance and prolong the service life due to its high heat exchange capacity and precise temperature control advantage. The traditional liquid cooling plate design mainly includes a single flow channel or a few flow channels, which absorbs the heat generated by the battery during charging and discharging through the circulation of cooling liquid. This design is common in early battery packs, and its advantages lie in relatively simple structure, easy manufacturing and maintenance.

[0003] However, with the improvement of battery pack endurance mileage and the application of fast charging technology, the heat generated by the battery under high load working conditions increases rapidly, and the requirement for heat dissipation efficiency also increases. The existing liquid cooling plate flow channel design often fails to fully consider the space utilization and heat source distribution inside the battery pack, resulting in uneven heat dissipation effect. Specifically, due to the limited number of flow channels and unreasonable layout, the battery cells close to the inlet of the flow channel may be over-cooled due to excessive cooling liquid flow, while the battery cells far from the inlet may not be cooled well due to insufficient flow, thereby affecting the temperature consistency of the entire battery pack. In addition, when the internal structure of the battery pack is complex, such as the existence of cross beams and other obstacles, the traditional design of the liquid cooling plate cannot achieve effective heat exchange, which not only limits the efficiency of the cooling system, but also may increase the weight and volume of the battery pack, thereby affecting the overall performance of the vehicle. SUMMARY

[0004] The embodiments of the present application provide a liquid cooling plate, an energy storage device, an energy storage system and an electric equipment, which at least have the advantages of improving the technical problem of uneven heat dissipation effect caused by unreasonable flow channel distribution of the liquid cooling plate in the prior art.

[0005] According to some embodiments of the present application, the present application provides a liquid cooling plate in one aspect, comprising a liquid cooling plate body and a flow channel, the liquid cooling plate body is provided with a cooling unit, the cooling unit is in thermal connection with a structure to be cooled, the cooling unit comprises at least two cooling surfaces; the flow channel is arranged on the liquid cooling plate body, the flow channel is used for circulating cooling liquid, and the flow channel is provided with an inlet and an outlet arranged at two ends of the flow channel respectively; wherein, the flow channel 200 comprises a flow guide branch 210 and a heat exchange unit 220, the heat exchange unit 220 is arranged on the cooling unit corresponding to the at least two cooling surfaces, the flow guide branch 210 is arranged corresponding to the heat exchange unit 220, one end of the flow guide branch 210 is in communication with the inlet 300, the other end of the flow guide branch 210 is arranged between adjacent two cooling surfaces, the inlet of the heat exchange unit 220 on each cooling surface is in communication with the other end of the flow guide branch 210, and the outlet of the heat exchange unit 220 on each cooling surface is in communication with the outlet 400.

[0006] In some embodiments, the heat exchange unit 220 comprises a first heat exchange branch 221 and a second heat exchange branch 222, the first heat exchange branch 221 is arranged opposite to one of the adjacent two cooling surfaces, the second heat exchange branch 222 is arranged opposite to the other of the adjacent two cooling surfaces, one end of the flow guide branch 210 is in communication with the inlet 300, the other end of the flow guide branch 210 is arranged between the first heat exchange branch 221 and the second heat exchange branch 222 of the heat exchange unit 220, the heat exchange inlet of the first heat exchange branch 221 and the heat exchange inlet of the second heat exchange branch 222 are in communication with the other end of the flow guide branch 210, and the heat exchange outlet of the first heat exchange branch 221 and the heat exchange outlet of the second heat exchange branch 222 are in communication with the outlet 400.

[0007] In some embodiments, the first heat exchange branch comprises a plurality of first sub-flow branches, the adjacent two first sub-flow branches are arranged in parallel with each other, each first sub-flow branch is arranged to extend in a preset direction, the inlet end of each first sub-flow branch is in communication with the other end of the flow guide branch, and the outlet end of each first sub-flow branch is in communication with each other; and / or, the second heat exchange branch comprises a plurality of second sub-flow branches, the adjacent two second sub-flow branches are arranged in parallel with each other, each second sub-flow branch is arranged to extend in a preset direction, the inlet end of each second sub-flow branch is in communication with the other end of the flow guide branch, and the outlet end of each second sub-flow branch is in communication with each other.

[0008] In some embodiments, each first sub-flow branch is arranged to extend in a direction away from the second heat exchange branch; each second sub-flow branch is arranged to extend in a direction away from the first heat exchange branch; and / or, each second sub-flow branch is arranged to extend in a direction close to the first heat exchange branch.

[0009] In some embodiments, the flow channel further comprises a circulation flow channel, at least a part of the circulation flow channel is arranged around the periphery of the heat exchange unit, an inlet end of the circulation flow channel is in communication with the liquid inlet, and an outlet end of the circulation flow channel is in communication with the liquid outlet.

[0010] In some embodiments, an area of a flow channel cross section of the circulation flow channel is c, and an area of a flow channel cross section of each heat exchange unit is b, where b≥2c.

[0011] In some embodiments, the liquid cooling plate body further comprises a mounting portion, the mounting portion is arranged between the first heat exchange branch and the second heat exchange branch of the heat exchange unit, a plurality of connecting holes are arranged on the mounting portion, and a connecting member is arranged in each connecting hole, the connecting member being used to connect the liquid cooling plate body and the structure to be cooled.

[0012] In some embodiments, a plurality of sets of cooling units are arranged on the liquid cooling plate body, the plurality of sets of cooling units are arranged in sequence along a preset direction, each set of cooling units is arranged in one-to-one correspondence with each structure to be cooled, each set of cooling units comprises at least two cooling surfaces, the flow channel comprises a plurality of flow diversion branches and a plurality of heat exchange units, each heat exchange unit is arranged on one of the plurality of sets of cooling units, each heat exchange unit comprises a first heat exchange branch and a second heat exchange branch, the plurality of flow diversion branches are arranged in one-to-one correspondence with the plurality of heat exchange units, one end of each flow diversion branch is in communication with the liquid inlet, and the other end of each flow diversion branch is arranged between the first heat exchange branch and the second heat exchange branch of the corresponding heat exchange unit.

[0013] In some embodiments, the flow channel further comprises a flow converging channel, the flow converging channel is arranged in heat exchange cooperation with the structure to be cooled, an outlet end of the flow converging channel is in communication with the liquid outlet, and an inlet end of the flow converging channel is in communication with an outlet end of the heat exchange unit.

[0014] In some embodiments, the flow converging channel comprises a plurality of flow converging branches, two adjacent flow converging branches are arranged in parallel with each other, and an extension direction of each flow converging branch is perpendicular to the preset direction of the plurality of sets of cooling units.

[0015] In some embodiments, the outlet end of each flow converging branch is in communication with the liquid outlet, the inlet end of each flow converging branch is in one-to-one correspondence with the outlet end of each heat exchange unit, and / or the inlet end of each flow converging branch is in communication with the outlet end of each heat exchange unit.

[0016] In some embodiments, an area of a flow channel cross section of each flow converging branch is a, and an area of a flow channel cross section of each heat exchange unit is b, where a>b.

[0017] In some embodiments, the liquid cooling plate further comprises a flow dividing portion, the flow dividing portion is arranged between the outlet end of the plurality of heat exchange units and the flow converging channel, the flow dividing portion comprises a plurality of reinforcing structures, and each reinforcing structure is arranged on the liquid cooling plate body along the preset direction.

[0018] According to some embodiments of the present application, another aspect of the embodiments of the present application provides an energy storage device, the energy storage device comprising the liquid cooling plate described above, and further comprising a battery assembly, the battery assembly comprising a plurality of battery packs, each of the battery packs being in heat exchange cooperation with one of the plurality of cooling surfaces.

[0019] In some embodiments, the battery assembly further comprises a middle beam, the plurality of battery packs being symmetrically arranged on both sides of the middle beam along the extension direction of the middle beam, the middle beam extending parallel to the horizontal plane on which the body of the liquid cooling plate is located, and the plurality of battery packs being connected to the body of the liquid cooling plate through the middle beam.

[0020] In some embodiments, the body of the liquid cooling plate is provided with one cooling unit, the cooling unit comprising two cooling surfaces, the battery assembly comprising two battery packs, the two battery packs being arranged on both sides of the middle beam, and the two cooling surfaces being arranged in one-to-one correspondence with the two battery packs; or, the body of the liquid cooling plate is provided with one cooling unit, the cooling unit comprising a plurality of cooling surfaces, the battery assembly comprising a plurality of battery packs, the plurality of battery packs being arranged in sequence along a direction perpendicular to the extension direction of the middle beam, the liquid cooling plate comprising a plurality of flow diversion branches, one end of each of the plurality of flow diversion branches being in communication with the liquid inlet, and the other end of each of the plurality of flow diversion branches being arranged in sequence in the middle of two of the plurality of cooling surfaces; or, the body of the liquid cooling plate is provided with a plurality of cooling units, the plurality of cooling units being arranged in sequence on the body of the liquid cooling plate along the extension direction of the middle beam, each of the cooling units comprising two cooling surfaces, the two cooling surfaces being symmetrically arranged on both sides of the middle beam, and the battery assembly comprising a plurality of battery packs, each of the battery packs being arranged in one-to-one correspondence with each of the cooling surfaces.

[0021] In some embodiments, the flow channel further comprises a converging flow path, an outlet end of the converging flow path being in communication with the liquid outlet, an inlet end of the converging flow path being in communication with the outlet end of the heat exchange unit, at least one of the plurality of battery packs being arranged in correspondence with at least part of the converging flow path to be in heat exchange cooperation with the converging flow path, and the remaining ones of the plurality of battery packs being arranged in one-to-one correspondence with the plurality of cooling surfaces.

[0022] In some embodiments, the energy storage device further comprises a first end plate, a second end plate and a shell, the liquid cooling plate, the first end plate, the second end plate and the battery assembly being arranged in the shell, the first end plate and the second end plate being arranged on the side of the liquid cooling plate close to the battery assembly, the first end plate and the second end plate being symmetrically arranged at the two ends of the liquid cooling plate with respect to the extension direction of the middle beam, and the first end plate and the second end plate being used to connect the liquid cooling plate and the shell.

[0023] According to some embodiments of the present application, another aspect of the embodiments of the present application provides an energy storage system, the energy storage system comprising the energy storage device described above, and further comprising an energy storage management system, the energy storage management system being in signal connection with the energy storage device to monitor the parameters of the energy storage device, so as to control the working state of the energy storage device.

[0024] According to some embodiments of the present application, another aspect of the embodiments of the present application provides a power utilization device, the power utilization device comprising the energy storage system, and the power utilization device being electrically connected to the energy storage system through the energy storage management system.

[0025] The technical solutions provided by the embodiments of the present application have at least the following advantages:

[0026] The heat exchange unit corresponding to the flow channel is arranged on the cooling unit of the liquid cooling plate body, and the inlet of the heat exchange unit is arranged between the two cooling surfaces through the flow branch, so that the cooling liquid flowing into the flow branch from the liquid inlet of the flow channel is directly guided to the space between the two cooling surfaces. This reduces the temperature of the cooling liquid flowing into the cooling surface away from the liquid inlet, improves the heat dissipation effect of the structure to be cooled corresponding to the cooling surface away from the liquid inlet, and at least helps to solve the technical problem of uneven heat dissipation effect caused by unreasonable distribution of the flow channel of the liquid cooling plate in the prior art. BRIEF DESCRIPTION OF DRAWINGS

[0027] One or more embodiments are exemplarily illustrated by the figures in the corresponding drawings, and these exemplary illustrations do not constitute a limitation on the embodiments, unless specifically stated. The figures in the drawings do not constitute a proportional limitation; in order to more clearly illustrate the technical solutions in the embodiments of the present application or in the prior art, the drawings needed in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application, and those skilled in the art can also obtain other drawings according to these drawings without creating any creative labor.

[0028] Figure 1 A front plan view of a liquid cooling plate of an embodiment of the present application;

[0029] Figure 2 A front plan view of a liquid cooling plate of an embodiment of the present application; Figure 1 An enlarged view of details at A of the liquid cooling plate of the embodiment of the present application;

[0030] Figure 3 A front plan view of a liquid cooling plate of an embodiment of the present application; Figure 1 An enlarged view of details at B of the liquid cooling plate of the embodiment of the present application;

[0031] Figure 4 A front plan view of a liquid cooling plate of an embodiment of the present application;

[0032] Figure 5 A front plan view of a liquid cooling plate of an embodiment of the present application;

[0033] Figure 6 A front plan view of a liquid cooling plate of an embodiment of the present application;

[0034] Figure 7A plan view of another embodiment of the liquid cooling plate of the energy storage device according to an embodiment of the present application.

[0035] 100, liquid cooling plate body;

[0036] 200, flow channel;

[0037] 210, flow diversion branch;

[0038] 220, heat exchange unit;

[0039] 221, first heat exchange branch;

[0040] 221a, first sub-flow branch;

[0041] 222, second heat exchange branch;

[0042] 222a, second sub-flow branch;

[0043] 300, liquid inlet;

[0044] 400, liquid outlet;

[0045] 500, converging flow path;

[0046] 510, converging branch;

[0047] 600, mounting portion;

[0048] 610, connecting hole;

[0049] 700, flow dividing portion;

[0050] 800, circulating flow channel;

[0051] 910, middle cross beam;

[0052] 920, first end plate;

[0053] 930, second end plate. DETAILED DESCRIPTION

[0054] In the description of the embodiments of the present application, the technical terms "first", "second", and the like are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly specified.

[0055] Reference to“an embodiment” herein means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase“in an embodiment” in various places in the specification are not necessarily referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. As will be apparent to those of ordinary skill in the art, embodiments described herein can be combined with other embodiments.

[0056] In the description of the embodiments of the present application, the term“and / or” is merely used to describe associated objects, and can represent that three conditions can exist, for example, A and / or B can represent that there are A, A and B exist, and B exists. In addition, the character“ / ” in the present application generally represents that the front and rear associated objects are in an“or” relationship.

[0057] In the description of the embodiments of the present application, the term“a plurality of” refers to two or more (including two), and similarly, “a plurality of groups” refers to two or more groups (including two groups), and “a plurality of pieces” refers to two or more pieces (including two pieces).

[0058] In the description of the embodiments of the present application, the technical terms“center”,“longitudinal”,“transverse”,“length”,“width”,“thickness”,“upper”,“lower”,“front”,“rear”,“left”,“right”,“vertical”,“horizontal”,“top”,“bottom”,“inner”,“outer”,“clockwise”,“counterclockwise”,“axial”,“radial”,“circumferential” and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0059] In the description of the embodiments of the present application, unless otherwise explicitly specified and limited, the technical terms“mounting”,“connecting”,“connecting”,“fixing” and the like should be understood broadly, for example, can be fixedly connected, or can be detachably connected, or can be integrated; can be mechanically connected, or can be electrically connected; can be directly connected, or can be indirectly connected through an intermediate medium; can be the internal communication of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0060] In the drawings corresponding to the embodiments of the present application, the thickness and area of a layer are exaggerated for clarity. When a component (such as a layer, film, region, or substrate) is described as being "on" or "in" another component, it can be "directly on" or "directly in" the other component, or intervening components can also be present. In contrast, when an element is referred to as being "directly on" or "directly in" another element, there are no intervening components present. Also, when a layer, film, region, or substrate is referred to as being "formed on" or "formed in" another layer, film, region, or substrate, it is meant to mean that the layer, film, region, or substrate is formed on or in the entire surface (or front surface) of the other layer, film, region, or substrate, or on or in a portion of the edge of the entire surface.

[0061] In the description of the embodiments of the present application, when a certain component "includes" another component, unless otherwise specified, it does not exclude the presence of other components, and other components can also be further included. In addition, when a layer, film, region, or plate, etc. component is referred to as "on / over" another component, it can be "directly on" another component (i.e. between the surface of another component and no other components), or another component can be present therebetween. In addition, when a layer, film, region, plate, etc. component is "directly on" another component, or when a layer, film, region, plate, etc. component is on the surface of another component, it is meant that no other component is located therebetween.

[0062] The terms used in the description of various described embodiments herein are used only to describe particular embodiments and are not intended to limit. As used in the description of various embodiments described and the appended claims, "the part" is also intended to include the plural, unless the context clearly indicates otherwise. Among them, the components include layers, films, regions, or plates, etc.

[0063] The embodiments of the present application will be described in detail below with reference to the accompanying drawings. However, those of ordinary skill in the art can understand that in the embodiments of the present application, many technical details are presented in order to enable the reader to better understand the present application. However, the technical solutions claimed by the present application can be implemented even without these technical details and based on various changes and modifications of the following embodiments.

[0064] As Figure 1As shown, the embodiment of the present application provides a liquid cooling plate, which comprises a liquid cooling plate body 100 and a flow channel 200. The liquid cooling plate body 100 is provided with a cooling unit. The cooling unit is in thermal contact with a structure to be cooled. The cooling unit comprises at least two cooling surfaces. The flow channel 200 is arranged on the liquid cooling plate body 100. The flow channel 200 is used for flowing cooling liquid. The flow channel 200 is provided with an inlet 300 and an outlet 400 arranged at two ends of the flow channel 200 respectively. The flow channel 200 comprises a flow guide branch 210 and a heat exchange unit 220. The heat exchange unit 220 is arranged on the cooling unit corresponding to the at least two cooling surfaces. The flow guide branch 210 is arranged corresponding to the heat exchange unit 220. One end of the flow guide branch 210 is in communication with the inlet 300. The other end of the flow guide branch 210 is arranged between adjacent two cooling surfaces. The inlet of the heat exchange unit 220 on each cooling surface is in communication with the other end of the flow guide branch 210. The outlet of the heat exchange unit 220 on each cooling surface is in communication with the outlet 400.

[0065] The liquid cooling plate of the embodiment of the present application is provided with the heat exchange unit 220 of the flow channel 200 corresponding to the cooling unit of the liquid cooling plate body 100, and the first heat exchange branch 221 and the second heat exchange branch 222 corresponding to the two cooling surfaces of the cooling unit. The heat exchange inlet of the first heat exchange branch 221 and the heat exchange inlet of the second heat exchange branch 222 are arranged between the two cooling surfaces through the flow guide branch 210. The cooling liquid flowing from the inlet 300 of the flow channel 200 into the flow guide branch 210 is directly guided to the space between the two cooling surfaces. The temperature of the cooling liquid flowing into the cooling surface away from the end of the inlet 300 is reduced. The heat dissipation effect of the structure to be cooled corresponding to the cooling surface away from the end of the inlet 300 is improved. The technical problem of uneven heat dissipation effect caused by unreasonable distribution of the flow channel of the liquid cooling plate in the prior art is at least improved.

[0066] The liquid cooling plate body 100 of the present application serves as a carrier and support structure for the entire liquid cooling system. The liquid cooling plate body 100 carries the flow channel 200 and other key components, ensuring the stable and efficient operation of the entire system. The flow channel 200 is the main channel for the transmission of cooling liquid, and its design directly affects the flow efficiency and uniformity of the cooling liquid. The inlet 300 and the outlet 400 are located at the two ends of the flow channel 200, and the flow guide branch 210 is responsible for guiding the cooling liquid from the inlet 300 to the space between the two cooling surfaces. The outlet end is connected to the outlet 400, so that the cooling liquid after heat exchange can be discharged from the liquid cooling plate body 100 in time, avoiding the decrease of cooling effect caused by stagnation. The inlet 300 is connected to one end of the flow guide branch 210, providing cooling liquid input for the flow channel 200. The outlet 400 is connected to the outlet of the heat exchange unit on each cooling surface, ensuring that the cooling liquid after heat exchange can be smoothly discharged. This design ensures the continuity and stability of the cooling liquid circulation, thereby maintaining the efficient operation of the entire liquid cooling system.

[0067] In the above embodiment, by correspondingly arranging the heat exchange unit on the cooling unit of the liquid cooling plate body 100, the liquid cooling plate of the present embodiment can ensure that the cooling liquid is precisely distributed as soon as it enters the liquid cooling system. After the cooling liquid enters from the liquid inlet 300, it is immediately guided to the middle position of the two cooling surfaces by the flow branch 210, which not only shortens the distance of the cooling liquid to the cooling surface, but also means that the cooling liquid can contact the structure to be cooled at a lower temperature in the initial stage, thereby maximizing its heat exchange capacity before the temperature of the cooling liquid rises. This method effectively reduces the initial temperature of the cooling liquid at the cooling surface away from the end of the liquid inlet 300, significantly improves the heat dissipation effect in this area, and avoids the problem of excessive temperature gradient of the cooling liquid in traditional liquid cooling systems.

[0068] The traditional liquid cooling plate often has an imbalance in the distribution of cooling liquid, resulting in excessive heat dissipation in the area close to the liquid inlet 300, and insufficient heat dissipation in the area away from the liquid inlet 300. This unevenness can seriously affect the overall heat dissipation efficiency and service life. In contrast, the liquid cooling plate design of the present embodiment directly guides the cooling liquid to the center of the two cooling surfaces through the flow branch 210, greatly improving the uniformity of the cooling liquid distribution. This design ensures that heat exchange on the entire liquid cooling plate can be carried out under similar conditions, whether in the area close to or away from the liquid inlet 300, the cooling effect is maintained in an efficient and balanced state. As a result, each part of the structure to be cooled can obtain the best cooling conditions, avoiding the phenomenon of local overheating or insufficient cooling.

[0069] Specifically, the heat exchange unit 220 includes a first heat exchange branch 221 and a second heat exchange branch 222, the first heat exchange branch 221 is arranged opposite to one of the two adjacent cooling surfaces, the second heat exchange branch 222 is arranged opposite to the other of the two adjacent cooling surfaces, one end of the flow branch 210 is in communication with the liquid inlet 300, the other end of the flow branch 210 is arranged between the first heat exchange branch 221 and the second heat exchange branch 222 of the heat exchange unit 220, the heat exchange inlet of the first heat exchange branch 221 and the heat exchange inlet of the second heat exchange branch 222 are in communication with the other end of the flow branch 210, and the heat exchange outlet of the first heat exchange branch 221 and the heat exchange outlet of the second heat exchange branch 222 are in communication with the liquid outlet 400.

[0070] The heat exchange unit 220 corresponding to the flow channel 200 is arranged on the cooling unit of the liquid cooling plate body 100, and the first heat exchange branch 221 and the second heat exchange branch 222 corresponding to the two cooling surfaces of the cooling unit are arranged. The heat exchange inlet of the first heat exchange branch 221 and the heat exchange inlet of the second heat exchange branch 222 are arranged between the two cooling surfaces through the flow branch 210, so that the cooling liquid flows from the liquid inlet 300 of the flow channel 200 to the flow branch 210 and is directly introduced between the two cooling surfaces. The temperature of the cooling liquid flowing into the cooling surface away from the liquid inlet 300 is reduced, the heat dissipation effect of the structure to be cooled corresponding to the cooling surface away from the liquid inlet 300 is improved, and at least the technical problem of uneven heat dissipation effect caused by unreasonable flow channel distribution of the liquid cooling plate in the prior art is improved.

[0071] The first heat exchange branch 221 and the second heat exchange branch 222 in the heat exchange unit 220 are matched with the cooling surface of the cooling unit to reduce the temperature of the structure to be cooled through heat exchange. The heat exchange unit 220 is the component that actually performs the heat exchange task, which is in close contact with the structure to be cooled through the first heat exchange branch 221 and the second heat exchange branch 222, and realizes rapid conduction and dispersion of heat. The first heat exchange branch 221 and the second heat exchange branch 222 are the core of the heat exchange unit 220, which are arranged opposite to the cooling surface and directly participate in the heat exchange process, and absorb heat from the structure to be cooled through interaction with the cooling liquid. The inlet end of the first heat exchange branch 221 and the second heat exchange branch 222 is in communication with the terminal end of the flow branch 210, ensuring that the cooling liquid can be uniformly distributed to each heat exchange branch, thereby improving the heat exchange efficiency.

[0072] The heat exchange unit arranged accurately on the liquid cooling plate body 100 realizes efficient heat exchange between the cooling liquid and the structure to be cooled through the effective cooperation of the first heat exchange branch 221 and the second heat exchange branch 222 with the cooling surface. Since the first heat exchange branch 221 and the second heat exchange branch 222 can directly contact the cooling surface of the cooling unit, this direct contact greatly improves the heat conduction efficiency and reduces the thermal resistance, so that the cooling liquid can quickly absorb heat and carry it away. At the same time, the design of the flow branch 210 ensures that the cooling liquid can be uniformly distributed between the first heat exchange branch 221 and the second heat exchange branch 222, avoiding the disorderly flow of the cooling liquid, further optimizing the heat exchange process, reducing energy waste, and improving the overall efficiency of the cooling system.

[0073] Another significant advantage of the above-mentioned liquid cooling plate design lies in its compact structure and compatibility with various structures to be cooled. By closely integrating the first heat exchange branch 221 and the second heat exchange branch 222 with the cooling surface and optimizing the introduction path of the cooling liquid, the liquid cooling plate not only achieves efficient heat management in a limited space, but also adapts to different types and sizes of structures to be cooled, without the need for major adjustments to the liquid cooling plate to achieve good cooling effect. This design flexibility and adaptability is particularly important for space-limited devices, significantly improving the market competitiveness and application range of the liquid cooling plate.

[0074] Specifically, as shown in Figure 2 the first heat exchange branch 221 includes a plurality of first sub-branches 221a, and adjacent two first sub-branches 221a are arranged in parallel with each other. Each first sub-branch 221a is arranged in a preset direction, the inlet end of each first sub-branch 221a is in communication with the other end of the flow guide branch 210, and the outlet ends of each first sub-branch 221a are in communication with each other. The first heat exchange branch 221 further refines the flow path of the cooling liquid through the plurality of first sub-branches 221a inside. These first sub-branches 221a are arranged in parallel with each other and extend in a preset direction, forming a uniform heat exchange network. The inlet end of each first sub-branch 221a is in communication with the terminal end of the flow guide branch 210, ensuring that the cooling liquid can be equally distributed to each first sub-branch 221a, achieving comprehensive and efficient heat exchange. The design that the outlet ends of each first sub-branch 221a are in communication with each other allows the cooling liquid to flow smoothly after heat exchange and eventually be discharged through the liquid outlet, avoiding the accumulation of cooling liquid at the outlet end and ensuring the continuity of the cooling liquid circulation and the stability of the system operation. Through the synergistic effect between the plurality of first sub-branches 221a inside the first heat exchange branch 221 and the flow guide branch 210, the liquid cooling plate of the present application can significantly improve the heat exchange efficiency and the uniformity of heat dissipation of the heat source. The parallel arrangement and preset direction extension of the first sub-branch 221a aim to maximize the contact area between the cooling liquid and the structure to be cooled, thereby improving the efficiency of heat exchange. At the same time, after the cooling liquid is evenly distributed from the flow guide branch 210 to each first sub-branch 221a, the temperature distribution of the cooling liquid in the first heat exchange branch 221 can be more uniform, avoiding the problem of local insufficient cooling or excessive cooling that may occur in traditional designs, and improving the overall cooling performance and reliability of the system.

[0075] Specifically, the second heat exchange branch 222 includes a plurality of second sub-branches 222a, two adjacent second sub-branches 222a are arranged in parallel with each other, and each second sub-branch 222a is arranged to extend in a preset direction. The inlet end of each second sub-branch 222a is in communication with the other end of the flow guide branch 210, and the outlet ends of the second sub-branches 222a are in communication with each other. The second heat exchange branch 222 internally includes a plurality of second sub-branches 222a, which are parallel to each other and extend in a preset direction, forming a set of uniformly distributed cooling networks. The inlet end of each second sub-branch 222a is directly connected to the terminal end of the flow guide branch 210, which means that the cooling liquid can be evenly distributed to each second sub-branch 222a, achieving more uniform heat exchange. The outlet ends of the second sub-branches 222a are in communication with each other, ensuring that the cooling liquid can smoothly converge after completing heat exchange and be discharged through the liquid outlet, avoiding the accumulation of cooling liquid at the outlet, and ensuring the continuity of the cooling liquid circulation and the stability of the system operation. The communication between the flow guide branch 210 and the second heat exchange branch 222, as well as the cooperation between the second sub-branches 222a inside the second heat exchange branch 222, together realize the optimization of the cooling liquid flow path and the uniformization of heat dispersion. The cooling liquid is evenly distributed to the second heat exchange branch 222 from the liquid inlet through the flow guide branch 210, and then the heat exchange process is further refined by the second sub-branch 222a, ensuring that the area of contact between the cooling liquid and the structure to be cooled is maximized, while avoiding the rapid rise in temperature of the cooling liquid in local areas, improving the efficiency and uniformity of heat exchange. This design makes the circulation of the cooling liquid more smooth and the heat exchange process more effective, providing excellent thermal management performance for high heat density applications.

[0076] Specifically, each first sub-branch 221a is arranged to extend away from the second heat exchange branch 222, and each second sub-branch 222a is arranged to extend away from the first heat exchange branch 221. This design ensures that after the cooling liquid enters the flow guide branch 210 from the liquid inlet, it can first be guided to the cooling area related to the first heat exchange branch 221, and each second sub-branch 222a extends away from the first heat exchange branch 221, which makes the cooling liquid diffuse outward from the center after flowing into the flow guide branch 210 and the end of the first heat exchange branch 221 and the second heat exchange branch 222, i.e., the cooling liquid flows into the first heat exchange branch 221 and the second heat exchange branch 222 in opposite directions.

[0077] Specifically, each first sub-branch 221a is arranged to extend away from the second heat exchange branch 222, and each second sub-branch 222a is arranged to extend away from the first heat exchange branch 221. This design ensures that after the cooling liquid enters the flow guide branch 210 from the liquid inlet, it can first be guided to the cooling area related to the first heat exchange branch 221, and each second sub-branch 222a extends away from the first heat exchange branch 221, which makes the cooling liquid diffuse outward from the center after flowing into the flow guide branch 210 and the end of the first heat exchange branch 221 and the second heat exchange branch 222, i.e., the cooling liquid flows into the first heat exchange branch 221 and the second heat exchange branch 222 in opposite directions. Figure 1As shown, the first heat exchange branch 221 further refines the heat exchange process through the internal multiple first sub-branches 221a. These first sub-branches 221a are arranged in an extending direction away from the second heat exchange branch 222, which means that the flow trend of the cooling liquid inside the first heat exchange branch 221 is to spread outwards from the center, so as to ensure that the cooling liquid can uniformly cover various parts of the first heat exchange branch 221. Similarly, the second sub-branches 222a inside the second heat exchange branch 222 are arranged in an extending direction close to the first heat exchange branch 221, forming a cooling liquid flow pattern converging from the outside to the center. This reverse flow design aims to complement the heat exchange between the second heat exchange branch 222 and the first heat exchange branch 221, so that the cooling liquid forms a closed circulation path between the two groups of heat exchange branches, further optimizing the distribution of the cooling liquid and the heat exchange efficiency. This design can ensure that a relatively stable heat exchange environment can be maintained on the entire liquid cooling plate even if the temperature of the cooling liquid gradually rises, improving the heat management capability and overall heat dissipation performance of the system. The flow direction arrangement between the first heat exchange branch 221 and the second heat exchange branch 222 constitutes a unique heat exchange strategy. The first sub-branches 221a extend in a direction away from the second heat exchange branch 222, while the second sub-branches 222a extend in a direction close to the first heat exchange branch 221. This bidirectional flow pattern realizes cross heat exchange of the cooling liquid on the liquid cooling plate, so that the cooling liquid can effectively cover and contact different areas of the battery pack during the flow through the first heat exchange branch 221 and the second heat exchange branch 222, ensuring the maximization of heat exchange between the cooling liquid and the battery pack. More importantly, this design can minimize the residence time of the cooling liquid in the flow channel, avoiding the decline of cooling effect caused by local temperature being too high, and improving the heat dissipation efficiency and stability of the entire liquid cooling system.

[0078] In particular, as Figure 3As shown, the flow channel 200 further comprises a circulation flow channel 800, at least a part of the circulation flow channel 800 is arranged around the periphery of the heat exchange unit 220, the inlet end of the circulation flow channel 800 is in communication with the liquid inlet 300, and the outlet end of the circulation flow channel 800 is in communication with the liquid outlet 400. At least a part of the circulation flow channel 800 is designed to be arranged around the periphery of the heat exchange unit 220, and such a layout ensures that the cooling liquid can fully contact the peripheral area of the heat exchange unit 220 before and after passing through the heat exchange unit 220, thereby achieving comprehensive cooling of the entire heat exchange unit 220 and its periphery. The presence of the circulation flow channel 800 not only increases the total area of the cooling liquid in contact with the battery module, but also ensures that the cooling liquid can uniformly surround the heat exchange unit 220, further improving the uniformity and efficiency of heat exchange. The inlet end of the circulation flow channel 800 is in communication with the liquid inlet 300, which means that after the cooling liquid enters from the liquid inlet 300, it will directly enter the circulation flow channel 800. At the same time, the outlet end of the circulation flow channel 800 is connected to the liquid outlet 400, which ensures that the cooling liquid after heat exchange can be smoothly discharged, forming a complete cooling cycle.

[0079] In the above embodiment, as shown, Figure 1 The circulation flow channel 800 first extends along the length direction of the liquid cooling plate body 100, then extends along the width direction of the liquid cooling plate body 100, and finally extends along the length direction of the liquid cooling plate body 100 and is in communication with the liquid outlet 400. Such a design allows a part of the cooling liquid to directly flow into the liquid outlet 400 without being heat-exchanged with the structure to be heat-exchanged through the first heat exchange branch 221 and the second heat exchange branch 222, thereby enhancing the cooling effect of the cooling surface away from the end of the liquid inlet 300.

[0080] Specifically, the cross-sectional area of ​​the circulation channel 800 is c, and the cross-sectional area of ​​the circulation channel of each heat exchange unit 220 is b, where b≥2c. The cross-sectional area c of the circulation channel 800 is designed to be relatively small. The key to this strategy is that it can accurately control and distribute a small amount of coolant to the circulation channel 800, and directly exchange heat with the structure to be dissipated near the liquid outlet 400. The cross-sectional area b of the flow channel of each heat exchange unit 220 is set to be greater than or equal to 2 times of c, that is, b≥2c. This design allows most of the coolant to flow through the heat exchange unit 220, and a small part of the coolant to flow through the circulation channel 800. The setting of the b value fully takes into account the concentration of the heat source. By increasing the cross-sectional area of ​​the flow channel in the heat exchange unit 220, the cooling capacity of the coolant in the high heat density area can be significantly improved, ensuring the overall heat dissipation performance of the liquid cooling system. By setting different flow channel cross-sectional areas between the circulation channel 800 and the heat exchange unit 220, the present embodiment achieves a dynamic balance between coolant flow rate and heat exchange efficiency. A smaller c value ensures that the circulation channel 800 can precisely control coolant distribution, enhancing cooling of localized heat sources; while a larger b value enhances the cooling effect within the heat exchange unit 220, improving the heat dissipation efficiency of concentrated heat sources.

[0081] Specifically, if Figure 1 、 Figure 2As shown, the liquid cooling plate body 100 further comprises a mounting portion 600, which is arranged between the first heat exchange branch 221 and the second heat exchange branch 222 of the heat exchange unit 220. The mounting portion 600 is provided with a plurality of connecting holes 610, and a connecting member is arranged in each connecting hole 610. The connecting member is used to connect the liquid cooling plate body 100 and the structure to be cooled. The mounting portion 600 is arranged between the first heat exchange branch 221 and the second heat exchange branch 222 of the heat exchange unit 220, which maximizes the use of the space of the liquid cooling plate body 100. The plurality of connecting holes 610 arranged on the mounting portion 600 enables the liquid cooling plate body 100 to be stably fixed on the structure to be cooled through the connecting member arranged in the connecting hole 610, ensuring the close contact between the liquid cooling plate and the structure to be cooled and ensuring the high efficiency of the heat exchange process. The first heat exchange branch 221 and the second heat exchange branch 222 in the heat exchange unit 220 are respectively responsible for heat exchange in different areas, and the position of the mounting portion 600 is selected to be between the two, which can fix the structure to be cooled in the optimal heat exchange path. This design ensures that the structure to be cooled not only can be in close contact with the first heat exchange branch 221 and the second heat exchange branch 222, but also can directly transfer heat to the cooling liquid through the mounting portion 600, thereby realizing direct and efficient heat exchange between the heat source and the cooling liquid and improving the heat dissipation performance of the entire liquid cooling system. The existence of the plurality of connecting holes 610 enables the connecting member to multi-point contact and fix the liquid cooling plate body 100 and the structure to be cooled, thereby enhancing the stability of the installation. At the same time, this multi-point contact design ensures that the thermal contact area between the liquid cooling plate body 100 and the structure to be cooled increases, thereby improving the heat exchange efficiency.

[0082] Specifically, the liquid cooling plate body 100 is provided with multiple groups of cooling units arranged in sequence along a predetermined direction, each group of cooling units is designed to be connected to a corresponding heat dissipation structure, and each group of cooling units includes at least two cooling surfaces. The flow channel 200 includes multiple flow diversion branches 210 and multiple heat exchange units 220, each heat exchange unit 220 is arranged on one of the multiple groups of cooling units, each heat exchange unit 220 includes a first heat exchange branch 221 and a second heat exchange branch 222, the multiple flow diversion branches 210 are arranged one-to-one with the multiple heat exchange units 220, one end of each flow diversion branch 210 is in communication with the liquid inlet 300, and the other end of each flow diversion branch 210 is arranged between the first heat exchange branch 221 and the second heat exchange branch 222 of the corresponding heat exchange unit 220. The liquid cooling plate body 100 is provided with multiple groups of cooling units arranged in sequence along a predetermined direction, each group of cooling units is designed to be connected to a corresponding heat dissipation structure. This layout ensures that the liquid cooling system can flexibly adapt to different types and locations of heat dissipation structures. The flow channel 200 integrates multiple flow diversion branches 210 and multiple heat exchange units 220, and each heat exchange unit 220 is arranged in one of the multiple groups of cooling units. This design embodies the modular concept of the liquid cooling system, which can provide customized heat exchange services for different heat dissipation structures by separating the heat exchange function, thereby enhancing the flexibility and efficiency of the system. One end of each flow diversion branch 210 is in seamless communication with the liquid inlet 300, ensuring that the cooling liquid can be uniformly and quickly introduced into each part of the liquid cooling plate body 100. The other end of the flow diversion branch 210 is carefully arranged between the first heat exchange branch 221 and the second heat exchange branch 222 of the corresponding heat exchange unit 220, which realizes precise distribution and efficient use of cooling liquid, ensuring that the cooling liquid can directly and fully act on the heat source, improving the heat exchange efficiency and overall cooling performance of the system. By designing the liquid cooling plate body 100 to include multiple groups of cooling units, each group of cooling units is equipped with at least two cooling surfaces, the liquid cooling system can contact the heat dissipation structure from all directions, achieving uniform heat exchange. At the same time, the corresponding arrangement of multiple flow diversion branches 210 and multiple heat exchange units 220 ensures that the inlet end of each heat exchange unit 220 is connected to the liquid inlet 300 with the shortest flow path, so that the temperature of the cooling liquid flowing into the heat exchange unit 220 far from the liquid inlet 300 is as little as possible affected by the heat energy of the heat dissipation structure.

[0083] In the above embodiments, as Figure 1As shown, the preset direction is along the width direction of the liquid cooling plate body 100, one end of each of the flow branches 210 is communicated with the liquid inlet 300, each of the flow branches 210 first extends along the width direction of the liquid cooling plate body 100, and then extends along the length direction of the liquid cooling plate body 100 to the middle position of the liquid cooling plate body 100, i.e., the middle of each of the heat exchange units 220, and then flows into the first heat exchange branch 221 and the second heat exchange branch 222, respectively.

[0084] Specifically, the flow channel 200 further includes a converging flow path 500, the converging flow path 500 is in heat exchange cooperation with the structure to be cooled, the outlet end of the converging flow path 500 is communicated with the liquid outlet 400, and the inlet end of the converging flow path 500 is communicated with the outlet end of the heat exchange unit 220. The flow channel 200 integrates the converging flow path 500, and the converging flow path 500 ensures that the cooling liquid discharged by all the heat exchange units 220 can be converged, and then flows to the final liquid outlet 400 after heat exchange with the structure to be cooled. By communicating the outlet end of the heat exchange unit 220 with the inlet end of the converging flow path 500, the cooling liquid is guided into the converging flow path 500 for heat exchange with the structure to be cooled after heat exchange with each of the heat exchange units 220. Although the cooling liquid has been heat exchanged with each of the heat exchange units 220 and the temperature has been increased, since the flow rate of the cooling liquid flowing in the converging flow path 500 is the sum of the flow rates of the multiple heat exchange units 220, the large flow rate of the cooling liquid can still ensure good heat exchange effect, thereby improving the heat exchange effect of the structure to be cooled close to the liquid outlet 400.

[0085] Specifically, the confluence flow path 500 includes a plurality of confluence branches 510, with two adjacent confluence branches 510 arranged parallel to each other, and the extension direction of each confluence branch 510 is perpendicular to the preset direction of the multiple groups of cooling units. The confluence flow path 500 is further subdivided into a plurality of confluence branches 510, which are arranged parallel to each other, ensuring that the flow path of the coolant inside the confluence flow path 500 is orderly and clear. The extension direction of each confluence branch 510 is perpendicular to the preset direction of the multiple groups of cooling units. The vertically extending confluence branches 510 can effectively collect and merge the coolant from different cooling units, while reducing the resistance and energy consumption of the coolant during the flow process, thereby improving the overall performance of the system. By setting up multiple confluence branches 510, the embodiment of the present application realizes intelligent management of the coolant flow path. The parallel arrangement between adjacent confluence branches 510 ensures that the coolant is evenly distributed inside the confluence flow path 500, avoiding local flow rates that are too fast or too slow, thereby improving the uniformity and stability of heat exchange. The extension perpendicular to the pre-set direction of the multiple cooling units ensures consistent coolant flow from the heat exchange unit 220 to the converging flow path 500, facilitating smooth coolant circulation within the system and improving the cooling efficiency and reliability of the liquid cooling system. The design of the converging branch 510 not only considers structural aesthetics and integration, but more importantly, enhances the heat exchange performance of the liquid cooling system.

[0086] Specifically, the outlet end of each converging branch 510 is connected to the liquid outlet 400; the inlet end of each converging branch 510 is connected to the outlet end of each heat exchange unit 220 in a one-to-one correspondence; Figure 1 As shown, the present application is provided with three heat exchange units 220, and three converging branches 510 are provided corresponding to the heat exchange units 220. The inlet end of each converging branch 510 is connected to the outlet end of each heat exchange unit 220 in a one-to-one correspondence. The outlet end of each converging branch 510 is directly connected to the liquid outlet 400, so that the coolant flowing through the converging branch 510 flows directly out of the liquid outlet 400.

[0087] Specifically, the outlet end of each of the plurality of flow collection branches 510 is in communication with the liquid outlet 400; the inlet end of each of the plurality of flow collection branches 510 is in communication with the outlet end of each of the plurality of heat exchange units 220. The outlet end of each of the plurality of flow collection branches 510 is designed to be in full communication with the liquid outlet 400, which enables all the cooling liquid passing through the heat exchange units 220 to be smoothly collected and mixed before flowing into the flow collection branches 510; the inlet end of each of the plurality of flow collection branches 510 is in communication with the outlet end of each of the plurality of heat exchange units 220, and this extensive communication design realizes the dead-angle-free flow of the cooling liquid from the heat exchange units 220 to the flow collection channel 500. It ensures that the cooling liquid discharged after being cooled by each of the plurality of heat exchange units 220 can be effectively collected and evenly distributed to each of the plurality of flow collection branches 510, and then efficiently returned through the liquid outlet 400. This connectivity optimization not only improves the utilization rate of the cooling liquid, but also guarantees the uniformity of heat exchange and the stability of system operation.

[0088] Specifically, the cross-sectional area of the flow passage of each of the plurality of flow collection branches 510 is a, and the cross-sectional area of the flow passage of each of the plurality of heat exchange units 220 is b, where a > b. The cross-sectional area a of the flow passage of each of the plurality of flow collection branches 510 is designed to be greater than the cross-sectional area b of the flow passage of each of the plurality of heat exchange units 220, i.e., a is greater than b. This differential design strategy aims to optimize the flow characteristics of the cooling liquid in the liquid cooling system and improve the heat exchange efficiency and overall system performance. Since each of the plurality of flow collection branches 510 is provided at the outlet of each of the plurality of heat exchange units 220, the flow rate of the cooling liquid flowing in each of the plurality of flow collection branches 510 is the sum of the flow rates of the cooling liquid flowing in the first heat exchange branch 221 and the second heat exchange branch 222 of each of the plurality of heat exchange units 220. Therefore, the cross-sectional area of the flow passage of each of the plurality of flow collection branches 510 needs to be designed to be greater than the cross-sectional area of the flow passage of each of the plurality of heat exchange units 220, specifically, the cross-sectional area of the flow passage of each of the plurality of flow collection branches 510 is the sum of the cross-sectional areas of the flow passages of each of the plurality of heat exchange units 220.

[0089] Specifically, the liquid cooling plate further comprises a flow distribution portion 700, which is arranged between the outlet ends of the plurality of heat exchange units 220 and the flow collection channel 500. The flow distribution portion 700 comprises a plurality of reinforcing structures, and each of the reinforcing structures is arranged on the liquid cooling plate body 100 along a predetermined direction. The flow distribution portion 700 in the liquid cooling plate body 100 is arranged between the outlet ends of the plurality of heat exchange units 220 and the flow collection channel 500, and plays a key role in regulating the flow rate of the cooling liquid and balancing the pressure. The introduction of the flow distribution portion 700 aims to optimize the transition process of the cooling liquid from the heat exchange units 220 to the flow collection channel 500, ensure the smooth distribution of the cooling liquid, reduce the energy loss and fluid resistance in the flow process, and improve the overall thermal management efficiency of the system. The plurality of reinforcing structures included in the flow distribution portion 700 are arranged on the liquid cooling plate body 100 along a predetermined direction, which enhances the structural strength of the liquid cooling plate body 100 in the region of the flow distribution portion 700, such as Figure 1As shown, there is an area between the outlet end of the heat exchange unit 220 and the confluence flow path 500 that is not provided with a flow channel structure. During the machining of the flow channel 200 of the liquid cooling plate body 100, a plurality of protruding structures are pressed in this area to make the upper and lower wall surfaces of the flow channel in this area adhere and protrude from the liquid cooling plate body 100. The plurality of protruding structures are reinforcing structures that are distributed in an array to uniformly distribute the cooling liquid flowing out of the outlet end of the heat exchange unit 220 into the confluence flow path 500, while enhancing the structural strength of the liquid cooling plate body 100 during transportation to prevent deformation of the liquid cooling plate body 100 due to impact.

[0090] The embodiment of the present application also provides a storage device, which comprises the liquid cooling plate. The storage device further comprises a battery assembly, and the battery assembly comprises a plurality of battery packs, each of which is in heat exchange cooperation with one of the plurality of cooling surfaces. The liquid cooling plate body 100 is designed with a plurality of cooling surfaces, and the cooling surfaces are arranged in close contact with the heat exchange surfaces of one of the plurality of battery packs, thereby realizing efficient heat exchange between the cooling liquid and the battery packs, ensuring that the heat generated by the battery packs during operation can be quickly absorbed and removed, and maintaining the battery packs within a safe temperature range, thereby ensuring the overall performance and safety of the storage device. The battery assembly in the storage device comprises a plurality of battery packs, each of which is in heat exchange cooperation with one of the cooling surfaces on the liquid cooling plate body 100. This one-to-one heat exchange cooperation design ensures that the liquid cooling system can accurately cool different battery packs according to their heat load requirements, avoiding the uneven cooling problem that may occur in traditional cooling methods. The close contact between the battery packs and the cooling surfaces greatly improves the heat transfer efficiency, enabling the liquid cooling system to continuously and effectively control the temperature of the battery packs during the operation of the storage device, thereby ensuring the long-term stable and efficient operation of the storage device.

[0091] Specifically, as Figure 4As shown, the battery assembly also includes a middle beam 910, a plurality of battery packs are symmetrically arranged on both sides of the middle beam 910 along the extension direction of the middle beam 910, the middle beam 910 extends parallel to the horizontal plane where the liquid cooling plate body 100 is located, and the plurality of battery packs are connected with the liquid cooling plate body 100 through the middle beam 910. The middle beam 910 is arranged to extend parallel to the horizontal plane where the liquid cooling plate body 100 is located, which not only strengthens the structural stability of the battery assembly, but also ensures that the plurality of battery packs can be in close contact with the liquid cooling plate body 100 in a relatively fixed position, maximizing heat exchange. The presence of the middle beam 910 provides lateral support and positioning for the battery assembly, ensuring the structural integrity of the battery assembly and effective heat exchange between the battery packs and the liquid cooling plate under various working conditions. The plurality of battery packs are symmetrically arranged on both sides of the middle beam 910 along the extension direction of the middle beam 910, which not only enhances the overall balance of the energy storage device, but also optimizes the thermal contact between the battery assembly and the liquid cooling plate body 100, ensuring that all battery packs can obtain uniform and efficient cooling effect. The symmetrically distributed battery packs can fully utilize the cooling surface on the liquid cooling plate body 100, achieving balanced allocation of cooling resources and avoiding the problem of local overheating or insufficient cooling.

[0092] Specifically, the liquid cooling plate body 100 is provided with a cooling unit, the cooling unit includes two cooling surfaces, the battery assembly includes two battery packs, and the two battery packs are arranged on both sides of the middle beam 910, and the two cooling surfaces are arranged in one-to-one correspondence with the two battery packs.

[0093] In some embodiments, as shown, Figure 5 The cooling unit is arranged on the liquid cooling plate body 100 and includes two cooling surfaces, which are closely combined with the structure of the liquid cooling plate body 100. The design of each cooling surface fully considers the size and thermal characteristics of the battery pack to ensure that the cooling liquid can flow along the optimal path and effectively absorb and transfer the heat generated by the battery pack. The two battery packs in the battery assembly are symmetrically arranged on both sides of the middle beam 910, and such a layout not only balances the weight of the battery assembly, but also promotes airflow circulation between the battery packs, which is conducive to natural heat dissipation. The arrangement of the middle beam 910 further enhances the structural rigidity of the battery assembly, preventing displacement of the battery packs under long-term operation or vibration environment, which affects the heat exchange performance. The two cooling surfaces are arranged in one-to-one correspondence with the two battery packs, ensuring that each battery pack has a dedicated cooling surface in close contact with it, forming an efficient heat exchange interface. This one-to-one matching design avoids the uneven cooling problem that may occur in traditional liquid cooling systems, improving the overall heat dissipation effect and temperature control accuracy of the battery pack, which is crucial for prolonging the battery life and ensuring the safe operation of the energy storage device.

[0094] Specifically, as shown, Figure 6As shown, the liquid cooling plate body 100 is provided with a cooling unit, the cooling unit includes a plurality of cooling surfaces, the battery assembly includes a plurality of battery packs, the plurality of battery packs are sequentially arranged along the extension direction perpendicular to the middle beam 910, the liquid cooling plate includes a plurality of flow branches 210, one end of the plurality of flow branches 210 is in communication with the liquid inlet 300, and the other end of the plurality of flow branches 210 is sequentially arranged between two of the plurality of cooling surfaces.

[0095] In other embodiments, the cooling unit on the liquid cooling plate body 100 includes a plurality of cooling surfaces, one end of the flow branch 210 is in communication with the liquid inlet 300, and the other end is sequentially arranged between two of the plurality of cooling surfaces. Such a layout design ensures that the cooling liquid can be uniformly distributed to each cooling surface. Through the guidance of the plurality of flow branches 210, the cooling liquid can quickly reach the target cooling area after entering the liquid cooling plate body 100 with minimal fluid resistance, thereby improving the cooling efficiency and uniformity of temperature control. The plurality of battery packs in the battery assembly are sequentially arranged along the extension direction perpendicular to the middle beam 910, and the plurality of battery packs are symmetrically arranged relative to the middle beam 910. The middle beam 910 not only provides a stable support structure, but also serves as a reference for the layout of the battery packs, ensuring that the battery packs can form an effective heat exchange interface with the corresponding cooling surface, even in a dense arrangement, and optimizing the thermal management performance.

[0096] Specifically, as shown, Figure 7 The liquid cooling plate body 100 is provided with a plurality of cooling units, the plurality of cooling units are sequentially arranged on the liquid cooling plate body 100 along the extension direction of the middle beam 910, each cooling unit includes two cooling surfaces, the two cooling surfaces are symmetrically arranged on both sides of the middle beam 910, and the battery assembly includes a plurality of battery packs, each battery pack is arranged one-to-one corresponding to each cooling surface. The liquid cooling plate body 100 is provided with a plurality of cooling units, which are sequentially arranged along the extension direction of the middle beam 910. Such a layout design enables the cooling unit to uniformly cover the entire liquid cooling plate body 100, not only improving the utilization rate of cooling resources, but also ensuring the stability and thermal management balance of the battery assembly in the extension direction of the middle beam 910. Each cooling unit includes two cooling surfaces, which are symmetrically arranged on both sides of the middle beam 910, and form a one-to-one correspondence with the plurality of battery packs in the battery assembly. The symmetric arrangement of the cooling surface not only enhances the uniformity of the thermal contact with the battery pack, but also optimizes the spatial layout of the battery pack, ensuring that each battery pack can obtain effective cooling from the cooling surface, improving the efficiency and reliability of the overall thermal management system. The middle beam 910 not only serves as a reference for the arrangement of the battery pack along its extension direction, but also provides necessary support and positioning functions, ensuring close contact between the battery pack and the cooling surface, and avoiding the decline of heat exchange efficiency caused by unstable structure or inaccurate positioning. As shown, Figure 1As shown, the present application includes six battery packs, three of which are arranged on one side of the middle cross beam 910, and the remaining three are arranged on the other side of the middle cross beam 910. The three battery packs on both sides of the middle cross beam 910 are arranged at intervals along the extension direction of the middle cross beam 910. A one-to-one correspondence is established between the plurality of cooling surfaces and the plurality of battery packs. Each cooling surface is designed to be in close contact with a battery pack, forming an efficient heat exchange channel. This precise matching design avoids waste of cooling resources and ensures that each battery pack can be cooled specifically, thereby improving the thermal management efficiency and energy utilization efficiency of the entire energy storage device.

[0097] Specifically, the flow channel 200 further includes a converging flow path 500, the outlet end of the converging flow path 500 communicates with the liquid outlet 400, the inlet end of the converging flow path 500 communicates with the outlet end of the heat exchange unit 220, at least one of the plurality of battery packs is arranged corresponding to at least part of the converging flow path 500 to cooperate with the converging flow path 500 for heat exchange, and the remaining plurality of battery packs are arranged one-to-one corresponding to the plurality of cooling surfaces. The inlet end of the converging flow path 500 communicates with the outlet end of the heat exchange unit 220, and the fluid cooled by the heat exchange unit 220 flows to the converging flow path 500, and at least one of the plurality of battery packs is arranged corresponding to at least part of the converging flow path 500 to cooperate with the converging flow path 500 for heat exchange. This design ensures that the cooling liquid can directly contact and cool at least one battery pack when flowing through the converging flow path 500, improving the response speed and cooling efficiency of the cooling system, and having a significant effect on rapidly reducing the temperature of the high heat load area. The remaining plurality of battery packs are arranged one-to-one corresponding to the plurality of cooling surfaces, and through this precise matching, each battery pack can form an effective heat exchange interface with a cooling surface, achieving uniformity and maximization of cooling effect. Such a design not only optimizes the heat exchange path, but also ensures that all battery packs can be cooled in the best state, thereby improving the thermal management performance of the entire battery assembly.

[0098] Specifically, the energy storage device further comprises a first end plate 920, a second end plate 930, and a shell, the liquid cooling plate, the first end plate 920, the second end plate 930, and the battery assembly are arranged in the shell, the first end plate 920 and the second end plate 930 are arranged on the side of the liquid cooling plate close to the battery assembly, the first end plate 920 and the second end plate 930 are symmetrically arranged at the two ends of the liquid cooling plate relative to the extension direction of the middle beam 910, and the first end plate 920 and the second end plate 930 are used for connecting the liquid cooling plate and the shell. The liquid cooling plate is arranged in the shell, the first end plate 920 and the second end plate 930 are located on the side of the liquid cooling plate close to the battery assembly, and the two end plates are symmetrically distributed at the two ends of the liquid cooling plate relative to the extension direction of the middle beam 910. This layout not only ensures the accurate positioning and stable support of the liquid cooling plate in the shell, but also optimizes the thermal management structure of the battery assembly, so that the first end plate 920 and the second end plate 930 can effectively connect the liquid cooling plate and the shell to form a closed and stable liquid cooling environment. The symmetric arrangement of the first end plate 920 and the second end plate 930 strengthens the structural symmetry and mechanical strength of the energy storage device, helps to uniformly distribute the internal pressure generated by the circulation of the cooling liquid, prevents the deformation of the shell, and ensures the long-term stable operation of the liquid cooling system. At the same time, the symmetric installation also simplifies the assembly process and reduces the production cost. The shell not only accommodates the liquid cooling plate, the first end plate 920, the second end plate 930, and the battery assembly, but also forms a complete closed space through the connection with the first end plate 920 and the second end plate 930, effectively isolating the external environment from interfering with the liquid cooling system. The integrated design of the shell not only protects the internal components, but also enhances the sealing and safety of the entire energy storage device, which plays an important role in maintaining the purity of the cooling liquid and preventing leakage.

[0099] In some embodiments, the middle beam 910 is a hollow structure; the first end plate 920 and the second end plate 930 are hollow structures. In this way, the middle beam 910 and the first end plate 920 and the second end plate 930 are all hollow structures, which can reduce the use of materials while ensuring the structural strength, thereby reducing the overall weight, reducing the manufacturing cost, and improving the energy density of the battery pack. Moreover, the hollow structure can serve as an air passage, which helps to optimize the thermal management system and improve the heat dissipation performance of the battery assembly, maintaining the battery within the ideal working temperature range and prolonging the service life of the battery.

[0100] In some embodiments, the first end plate 920 and the second end plate 930 form a rectangular hollow structure inside, and the first end plate 920 and the second end plate 930 are connected with the liquid cooling plate body 100 through connecting pieces.

[0101] The above arrangement, by constructing a rectangular hollow structure, the first end plate 920 and the second end plate 930 obtain higher structural strength and rigidity, can effectively bear the weight of the battery assembly and the impact force from the outside, and ensure the structural stability and safety of the battery pack under various working conditions. Moreover, the arrangement of the connection between the first end plate 920 and the second end plate 930 and the cooling surface of the liquid cooling plate body 100 ensures the flow of the cooling liquid is not hindered, optimizes the heat dissipation path, maintains the working temperature of the battery assembly within the optimal range, prolongs the battery life, and improves the overall thermal management efficiency. At the same time, the design of the hollow structure reduces the amount of material used for the first end plate 920 and the second end plate 930, reduces the weight, and the compact layout reduces the occupation of the internal space of the battery device, which is conducive to more efficient arrangement of the battery assembly, improves the energy density and space utilization of the battery pack.

[0102] The energy storage device provided by the embodiment of the present application also provides an energy storage system including the energy storage device. The energy storage system includes an energy storage management system in signal connection with the energy storage device to monitor parameters of the energy storage device, thereby controlling the working state of the energy storage device. The energy storage management system and the energy storage device maintain continuous signal interaction, which enables the management system to obtain various operating parameters of the energy storage device in real time, including but not limited to the temperature, voltage, and current of the battery assembly, and the pressure and flow of the liquid cooling system. Through such signal connection, the energy storage management system can comprehensively grasp the health and working conditions of the energy storage device, providing a solid data foundation for subsequent intelligent control. According to the monitoring data received from the energy storage device, the energy storage management system can intelligently judge whether the current working state meets the expectations, such as whether the battery temperature is too high or the cooling liquid flow is sufficient. Once an abnormal situation is detected, the management system will immediately take measures to adjust the working mode of the energy storage device, such as starting additional cooling functions, reducing charging and discharging power, etc., to ensure that the energy storage device operates within a safe and stable range.

[0103] The cooperative work between the energy storage management system and the energy storage device not only improves the safety and reliability of the energy storage device, but also optimizes the energy management and scheduling mechanism of the entire energy storage system. Through real-time monitoring and intelligent control, the energy storage system can automatically adapt to different application scenarios, whether it is to quickly respond to changes in power demand or to maintain a long-term stable operating state, and it performs well, maximizing the potential of the energy storage device and improving energy utilization efficiency and economic benefits.

[0104] The application also provides a power utilization device, which comprises the above-mentioned energy storage system. The power utilization device is electrically connected to the energy storage system through the energy storage management system. The energy storage management system and the energy storage device maintain a continuous signal link, which allows the management system to monitor the key parameters of the energy storage device in real time, including but not limited to the health status of the battery, the operation efficiency of the liquid cooling system, and the energy state of the entire energy storage device. Based on these real-time data, the energy storage management system can accurately control the working mode of the energy storage device, including adjusting the charging rate and optimizing the discharging strategy, to ensure the optimal storage and release of electric energy. The power utilization device is electrically connected to the energy storage system through the energy storage management system. This connection mechanism means that the power utilization device can directly use the electric energy stored in the energy storage system without additional conversion links. More importantly, through the intelligent scheduling of the energy storage management system, the power utilization device can flexibly call electric energy according to actual needs, realize on-demand power supply, and greatly improve the flexibility and economy of electric energy use.

[0105] The coordinated work among the power utilization device, the energy storage system, and the energy storage management system builds a closed-loop electric energy supply chain. The energy storage management system not only serves as the "brain" of the energy storage device, responsible for decision-making and scheduling, but also serves as a bridge between the power utilization device and the energy storage system, ensuring efficient transmission and use of electric energy. This overall design means that the power utilization device can quickly obtain sufficient energy when needed, while avoiding the damage caused by excessive charging and discharging to the energy storage device, maximizing the use of electric energy.

[0106] The application using the above-mentioned embodiments has the following beneficial effects:

[0107] Enhanced heat exchange efficiency

[0108] The cooling unit on the liquid cooling plate body 100 includes at least two cooling surfaces, which are closely combined with the first heat exchange branch 221 and the second heat exchange branch 222 of the flow channel 200, realizing effective heat exchange between the cooling liquid and the structure to be cooled. This design optimizes the heat conduction path, improves the heat exchange efficiency, and ensures the temperature stability of the battery assembly.

[0109] Precise temperature control

[0110] The first heat exchange branch 221 includes a plurality of first sub-flow branches 221a, and the second heat exchange branch 222 includes a plurality of second sub-flow branches 222a. Through the refinement of the flow channel and the parallel arrangement, the cooling liquid can be evenly distributed to precisely control the temperature of the battery pack, avoid local overheating, and prolong the service life of the energy storage device.

[0111] Strengthen the structural stability

[0112] By setting the circulation flow channel 800 and controlling the relationship between the cross-sectional area c of the flow channel and the cross-sectional area b of the heat exchange unit 220, the application embodiment not only improves the circulation efficiency of the cooling liquid, but also enhances the stability of the structure, effectively preventing deformation caused by thermal stress.

[0113] Convenient installation and structural optimization

[0114] The mounting portion 600 on the liquid cooling plate body 100 and the setting of the connecting hole 610 simplify the connection process of the liquid cooling plate and the structure to be cooled, improving the assembly efficiency. At the same time, through the setting of multiple cooling units, matching multiple battery packs, the optimized combination of structure and function is realized, improving the pertinence and effectiveness of cooling.

[0115] Synergistic effect of confluence flow path and distribution portion

[0116] The communication between the confluence flow path 500 and the outlet ends of multiple heat exchange units 220 and the liquid outlet 400, combined with the setting of the reinforcing structure in the distribution portion 700, effectively controls the flow and pressure of the cooling liquid, optimizes the distribution of the cooling liquid, and further improves the efficiency and stability of thermal management.

[0117] Symmetrical design of battery assembly and middle cross beam

[0118] The symmetrical setting of the battery assembly and the middle cross beam 910, as well as the precise correspondence of the cooling unit and the battery pack, ensures the uniform distribution of thermal load, improves the overall thermal management performance of the battery assembly, and supports the high-power output and long-time operation of the energy storage device.

[0119] Overall integration and efficiency of energy storage device

[0120] Through the collaborative design between the liquid cooling plate body 100, the first end plate 920, the second end plate 930 and the shell in the energy storage device, a whole integrated liquid cooling environment is formed, which protects the internal components, enhances the system's sealing and durability, and provides comprehensive thermal management and mechanical protection for the energy storage device.

[0121] Intelligent regulation of energy storage management system

[0122] The signal connection between the energy storage management system and the energy storage device can monitor the key parameters of the energy storage device in real time, realizing intelligent regulation. This design ensures the safe and stable operation of the energy storage device under complex working conditions, improves the efficiency of electric energy utilization, and reduces energy waste.

[0123] Efficient energy utilization of electrical equipment

[0124] The electric equipment is electrically connected with the energy storage system, and through intelligent scheduling of the energy storage management system, on-demand supply of electric energy is realized, flexibility and economy of energy utilization are improved, stable and reliable energy supply is provided for the electric equipment, and the self-adaptability and response speed of the system are also enhanced.

[0125] To sum up, through the component cooperation and intelligent control mechanism among the liquid cooling plate, the energy storage device, the energy storage system and the electric equipment, efficient, stable and intelligent energy storage and utilization are realized. This series of innovative designs not only optimizes the heat management performance and improves the energy utilization efficiency, but also enhances the reliability and economy of the system, providing strong technical support for building a smart, green and sustainable energy utilization system.

[0126] Those skilled in the art can understand that the above-mentioned embodiments are specific embodiments for realizing the present application, and in actual application, various changes can be made in form and details without departing from the spirit and scope of the present application. Any person skilled in the art can make various modifications and changes without departing from the spirit and scope of the present application, therefore the protection scope of the present application should be limited by the scope defined in the claims.

Claims

1. A liquid cooling plate, characterized in that: The application relates to a liquid cooling plate body (100) provided with a cooling unit, which is in heat conduction connection with a structure to be cooled, and the cooling unit comprises at least two cooling surfaces. A flow channel (200) is arranged on the liquid cooling plate body (100), and the flow channel (200) is used for circulating cooling liquid and is provided with an inlet (300) and an outlet (400) at two ends of the flow channel (200) respectively. The flow channel (200) comprises a flow guide branch (210) and a heat exchange unit (220), the heat exchange unit (220) is arranged on the cooling unit corresponding to the at least two cooling surfaces, the flow guide branch (210) is arranged corresponding to the heat exchange unit (220), one end of the flow guide branch (210) is in communication with the inlet (300), the other end of the flow guide branch (210) is arranged between adjacent two cooling surfaces, the inlet of the heat exchange unit (220) on each cooling surface is in communication with the other end of the flow guide branch (210), and the outlet of the heat exchange unit (220) on each cooling surface is in communication with the outlet (400). The heat exchange unit (220) comprises a first heat exchange branch (221) and a second heat exchange branch (222), the first heat exchange branch (221) is arranged opposite to one of the adjacent two cooling surfaces, the second heat exchange branch (222) is arranged opposite to the other of the adjacent two cooling surfaces, one end of the flow guide branch (210) is in communication with the inlet (300), the other end of the flow guide branch (210) is arranged between the first heat exchange branch (221) and the second heat exchange branch (222) of the heat exchange unit (220), the heat exchange inlets of the first heat exchange branch (221) and the second heat exchange branch (222) are in communication with the other end of the flow guide branch (210), and the heat exchange outlets of the first heat exchange branch (221) and the second heat exchange branch (222) are in communication with the outlet (400).

2. The liquid cold plate of claim 1, wherein, The first heat exchange branch (221) comprises a plurality of first sub-flow branches (221a), adjacent two first sub-flow branches (221a) are arranged in parallel to each other, each first sub-flow branch (221a) is arranged in extension along a preset direction, the inlet end of each first sub-flow branch (221a) is in communication with the other end of the flow guide branch (210), and the outlet ends of the first sub-flow branches (221a) are in communication with each other; and / or 3. The liquid cold plate of claim 2, wherein, The second heat exchange branch (222) comprises a plurality of second sub-flow branches (222a), adjacent two second sub-flow branches (222a) are arranged in parallel to each other, each second sub-flow branch (222a) is arranged in extension along a preset direction, the inlet end of each second sub-flow branch (222a) is in communication with the other end of the flow guide branch (210), and the outlet ends of the second sub-flow branches (222a) are in communication with each other. ​ 4. The liquid cold plate of claim 3, wherein, Each of the first sub-flow branches (221a) is arranged to extend in a direction away from the second heat exchange branch (222); Each of the second sub-flow branches (222a) is arranged to extend in a direction away from the first heat exchange branch (221); and / or, Each of the second sub-flow branches (222a) is arranged to extend in a direction close to the first heat exchange branch (221).

5. The liquid cold plate of claim 1, wherein, The flow channel (200) further comprises a circulation flow channel (800), at least a part of the circulation flow channel (800) is arranged around the periphery of the heat exchange unit (220), the inlet end of the circulation flow channel (800) is in communication with the liquid inlet (300), and the outlet end of the circulation flow channel (800) is in communication with the liquid outlet (400).

6. The liquid cold plate of claim 5, wherein, The area of the flow channel cross section of the circulation flow channel (800) is c, and the area of the flow channel cross section of each of the heat exchange units (220) is b, wherein b≥2c. The liquid cooling plate body (100) further comprises a mounting portion (600) arranged between the first heat exchange branch (221) and the second heat exchange branch (222) of the heat exchange unit (220), a plurality of connecting holes (610) are arranged on the mounting portion (600), and a connecting member is arranged in each of the connecting holes (610), and the connecting member is used to connect the liquid cooling plate body (100) and the structure to be cooled.

7. The liquid cold plate of claim 2, wherein, A plurality of cooling units are arranged on the liquid cooling plate body (100), the plurality of cooling units are arranged in sequence along a preset direction, each of the cooling units is arranged in one-to-one correspondence with each of the structures to be cooled, each of the cooling units comprises at least two cooling surfaces, the flow channel (200) comprises a plurality of flow guide branches (210) and a plurality of heat exchange units (220), each of the heat exchange units (220) is arranged on one of the plurality of cooling units, each of the heat exchange units (220) comprises a first heat exchange branch (221) and a second heat exchange branch (222), the plurality of flow guide branches (210) are arranged in one-to-one correspondence with the plurality of heat exchange units (220), one end of each of the flow guide branches (210) is in communication with the liquid inlet (300), and the other end of each of the flow guide branches (210) is arranged between the first heat exchange branch (221) and the second heat exchange branch (222) of the corresponding heat exchange unit (220).

8. The liquid cold plate of claim 1, wherein, The flow channel (200) further comprises a flow collecting channel (500), the flow collecting channel (500) is arranged in heat exchange cooperation with the structure to be cooled, the outlet end of the flow collecting channel (500) is in communication with the liquid outlet (400), and the inlet end of the flow collecting channel (500) is in communication with the outlet end of the heat exchange unit (220).

9. The liquid cold plate of claim 8, wherein, The flow collecting channel (500) comprises a plurality of flow collecting branches (510), and two adjacent flow collecting branches (510) are arranged in parallel with each other, and the extension direction of each of the flow collecting branches (510) is perpendicular to the preset direction of the plurality of cooling units.

10. The liquid cold plate of claim 9, wherein, ​ 11. The liquid cold plate of claim 10, wherein, The outlet end of each of the confluence branches (510) is in communication with the liquid outlet (400); The inlet end of each of the confluence branches (510) is in communication with the outlet end of each of the heat exchange units (220) in a one-to-one correspondence; and / or, The inlet end of each of the confluence branches (510) is in communication with the outlet end of each of the heat exchange units (220).

12. The liquid cold plate of claim 10, wherein, The cross-sectional area of the flow channel of each of the confluence branches (510) is a, and the cross-sectional area of the flow channel of each of the heat exchange units (220) is b, wherein a > b.

13. The liquid cold plate of claim 9, wherein, The liquid cooling plate further comprises a flow distribution portion (700) disposed between the outlet end of the plurality of heat exchange units (220) and the confluence flow path (500), and the flow distribution portion (700) comprises a plurality of reinforcing structures, each of which is disposed on the liquid cooling plate body (100) along a predetermined direction.

14. An energy storage device comprising the liquid cooling plate according to any one of claims 1 to 13, characterized by, The energy storage device further comprises: A battery assembly comprising a plurality of battery packs, each of which is in heat exchange cooperation with one of the plurality of cooling surfaces.

15. The energy storage device of claim 14, wherein, The battery assembly further comprises a middle cross beam (910), and the plurality of battery packs are symmetrically disposed on both sides of the middle cross beam (910) along the extension direction of the middle cross beam (910), the middle cross beam (910) extends parallel to the horizontal plane on which the liquid cooling plate body (100) is located, and the plurality of battery packs are connected with the liquid cooling plate body (100) through the middle cross beam (910).

16. The energy storage device of claim 15, wherein, The liquid cooling plate body (100) is provided with one cooling unit, the cooling unit comprises two cooling surfaces, the battery assembly comprises two battery packs, the two battery packs are disposed on both sides of the middle cross beam (910), and the two cooling surfaces are disposed in a one-to-one correspondence with the two battery packs; or, The liquid cooling plate body (100) is provided with one cooling unit, the cooling unit comprises a plurality of cooling surfaces, the battery assembly comprises a plurality of battery packs, the plurality of battery packs are sequentially disposed along a direction perpendicular to the extension direction of the middle cross beam (910), the liquid cooling plate comprises a plurality of flow guide branches (210), one end of the plurality of flow guide branches (210) is in communication with the liquid inlet (300), and the other end of the plurality of flow guide branches (210) is sequentially disposed between two of the plurality of cooling surfaces; or, The liquid cooling plate body (100) is provided with a plurality of cooling units, the plurality of cooling units are sequentially disposed on the liquid cooling plate body (100) along the extension direction of the middle cross beam (910), each of the cooling units comprises two cooling surfaces, the two cooling surfaces are symmetrically disposed on both sides of the middle cross beam (910), and the battery assembly comprises a plurality of battery packs, each of the battery packs is disposed in a one-to-one correspondence with each of the cooling surfaces.

17. The energy storage device of claim 14, wherein, The flow channel (200) further comprises a converging flow path (500), an outlet end of the converging flow path (500) being communicated with the liquid outlet (400), an inlet end of the converging flow path (500) being communicated with an outlet end of the heat exchange unit (220), at least one of the plurality of battery packs being arranged corresponding to at least part of the converging flow path (500) to exchange heat with the converging flow path (500), and the rest of the plurality of battery packs being arranged corresponding to the plurality of cooling surfaces one by one.

18. The energy storage device of claim 15, wherein, The energy storage device further comprises a first end plate (920), a second end plate (930) and a shell, the shell being provided with the liquid cooling plate, the first end plate (920), the second end plate (930) and the battery assembly, the first end plate (920) and the second end plate (930) being arranged on a side of the liquid cooling plate close to the battery assembly, the first end plate (920) and the second end plate (930) being symmetrically arranged at two ends of the liquid cooling plate with respect to an extension direction of the middle beam (910), and the first end plate (920) and the second end plate (930) being used for connecting the liquid cooling plate and the shell.

19. An energy storage system comprising the energy storage device of claim 14, wherein, The energy storage system comprises an energy storage management system, the energy storage management system being signal connected with the energy storage device to monitor parameters of the energy storage device, so as to control a working state of the energy storage device.

20. An electrical device, comprising: The energy storage system comprises the energy storage system as claimed in claim 19, and the electrical equipment is electrically connected with the energy storage system through the energy storage management system.

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